MICRF600_06 Datasheet, PDF (9/21 Pages) Micrel Semiconductor – 902-928MHz ISM Band Transceiver Module

Micrel, Inc.
MICRF600/MICRF600Z
How to write:
• Bring CS high
• Use SCLK and IO to clock in the 23 octets
• Bring CS low
Refer to the figure in the next section, “Writing to n
registers having incremental addresses”.
Writing to n Registers Having Incremental Addresses
In addition to entering all bytes, it is also possible to enter
a set of n bytes, starting from address i = “A6, A5, … A0”.
Typical example: Clock in a new set of frequency dividers
(i.e. change the RF frequency). “Incremental addresses”.
Registers to be written are located in i, i+1, i+2.
What to write:
Field
Comments
Address: 7 bit = A6, A5, …A0 (A6 = msb. A0 = lsb) (address of first byte to
write to)
R/W bit: “0” for writing
Values:
n* 8 bits =
D7, D6, …D0 (D7 = msb, D0 = lsb) (written to control reg. with
address ”i”)
D7, D6, …D0 (D7 = msb, D0 = lsb) (written to control reg. with
address ”i+1”)
D7, D6, …D0 (D7 = msb, D0 = lsb) (written to control reg. with
address ”i+n-1”)
Table 5. “Address” and “R/W bit” together make 1 octet.
In addition, n octets with programming bits are entered.
Totally. 1 +n octets are clocked into the MICRF600.
How to write:
• Bring CS high
• Use SCLK and IO to clock in the 1 + n octets
• Bring CS low
In Figure 1, IO is changed at positive edges of SCLK. The
MICRF600 samples the IO line at negative edges. The
value of the R/W bits is always “0” for writing.
CS
SCLK
IO
A6 A5
A0 RW D7 D6
D2 D1 D0
Address of first
register to write to,
register i
RW Data to write Data to write
into register i into register i+1
Internal load pulse made here
Figure 2. How to write to many Control Registers
Reading from the Control Registers in MICRF600
The “read-sequence” is:
1. Enter address and R/W bit
2. Change direction of IO line
3. Read out a number of octets and change IO
direction back again.
It is possible to read all, 1 or n registers. The address to
read from (or the first address to read from) can be any
valid address (0-22). Reading is not destructive, i.e. values
are not changed. The IO line is output from the MICRF600
(input to user) for a part of the read-sequence. Refer to
procedure description below.
A read-sequence is described for reading n registers,
where n is number 1-23.
Reading n Registers from MICRF600
CS
SCLK
IO
A6 A5
A0 RW D7
D6
D0
Address of register i
RWData read from reg. i
Simple time
IO Input
IO Output
Figure 3. How to read from many Control Registers
In Figure 3, 1 register is read. The address is A6, A5, …
A0. A6 = msb. The data read out is D7, D6, …D0. The
value of the R/W bit is always “1” for reading.
SCLK and IO together form a serial interface. SCLK is
applied externally for reading as well as for writing.
• Bring CS active
• Enter address to read from (or the first address to
read from) (7 bits) and
• The R/W bit = 1 to enable reading
• Make the IO line an input to the user (set pin in
tristate)
• Read n octets. The first rising edge of SCLK will
set the IO as an output from the MICRF600.
MICRF will change the IO line at positive edges.
The user should read the IO line at the negative
edges.
• Make the IO line an output from the user again.
July 2006
9
M9999-082505